Device for sharpening shears.



G. P. SHEFFIELD. DEVICE FOR SHARPENING SHBARS. VAPPIIIOAPTION FILED HA3.1, 1907.

932,586, PatentedAug.31,1909.

and by dotted lines..-

upper abrader, detaclied,with a rem'ovabley q mnvreesonsmim nnmeSHEARS'.

Specification of Letters Patent.

Patented Aug. 3 1', 1969;

Application fil ed March 1, 1307; Serial ire-360,098.

To all whom it may concern:

Be it known that 12, GEORGE'P. SHErFiELD, of Rochester, in the county,of Monroe and State of New York, have'invented a-new and usefulImprovement irrDevices-for Sharpening? Shears, which improvement is"fullyset forth in the followingspeoificationand shown in theaccompanying drawings. f

My invention is an improved device for quickly and convenientlysharpenirig v shears by passing the: blades of the shears across thesurfacesof abraders, both blades being. sharpened simultaneously. I fOne object of the invention; among others, is to provide a pair ofcoacting pivot-alabrade'rsthat willadjust themselves to the changingangle or position of theconvergent edges of the shears as-the latter ismoved across their roughened surfaces;

Other objects and advantages of" the in-: vention will be brought outand made to ap pear in the following description, and the novel featurespointed out in theappended claims, reference being: bad to theaccompanying drawings: which, with the reference characters markedthereon, forln a part of this: specification. V r

Figure 1 is a a front elevation of the device ready foruse; Fig.- 2 isa: cross section? of parts taken on the d'otte'd linea in Fig; 1, theabraders beingfshownin twoipositions by full Fig.3 is a plan of the partshown-in dotted-lines Figeiisan end view of the abra'ders, andthespindle in: cross section, showing the devicesas in use, arts beingshown invarious positionsby ful and by dottedlines. Fig.5 isaplanoft=hec'i-rc'u l'ar metal head, showingithe cavity, thespin dlebeingfin tr "nsverse section. Fig; G'is an elevation of the'shiftablegage, the associ- Fig. 7* is aplanof an orti'on of the "rear'faceof theupper abrader, roken away to'show; the under side of the gage.vatioirof' parts at oneend of the device seen: in a direction oppositeto that inwhi'ch Fig. 1 is seen, partsbeing in central longitudinalsection:

Referringxto the parts shown; [1- 1 are ap'air' of similar abraders,commonly thin rectangular'pla-tes-of hardened steel having their operating'facesmaderough as by being grooved ve'ni'ent use of thed'evi'ceto be seizedby the left hand, a reduced part of which enters'the hollowof the headBycommonly oval'in form, and made" rigid therewith. Anornamental knobx6, Figs. 1 and 8*, is also usually pro vided enteringthe hollow of the circular head 4 and adapted to turn therein.

Fig; 8" is arear ele- Theh'ea'dsB, 4*, the handle5 andtlieknob' 6 arecoaX-ial' and joined by an axial shaft or spindle- 7, Figs: 1', 2, 4', 5andt8, a transverse pin:8,Fig. 1-,servingto hold theliandleand f thehead 3 rigid withflthespindle. f die is commonly made fl tatitsoverh'anging The spinend,the head 4; being formed with acentralopening correspondingly shaped, so the head mayno't turnon' the spindleto the end that 3 the rests for the-trunn1ons'2 of the abrader's may bekept directly opposite the respective The extreme end and theknob '6 isrests'i'n the oval head 3.

of the spindle is: threaded 9 provided with'ascreW-Hrit 9, Fig. 8rigidly in place, to engagewith said threaded part of- 3 the spindle, bymeansof which the knob and the head l may be removed fromt'l're spindleforthe purpose ofrenewing the abraders or for other purposes; Whenreplacing the abradersthe trunnionsZ at'theprop'er ends are insertedinthe rests inthe head 3 and the head 4: is slip-ped upon'the s indle toreceive the opposite trunnions. he knob 6 with j the nut 9 beingturnedto place onthe spin i one serves to press the" head 4 against theabraders-,-shoulders 10,-Fig. 8, at the ends-of ated abrader being. in:transverse sectiona the" flattenedsurfaces of the spindle, serving asstops for the head, the abradersbeing leftfreeto turnonflreir trunnions2.

An inspection of Fig; 4 will clearly reveal f the manner 'ofusingthedevice; The shears, l ltiare opened and their edges passed uponand across the" roughened surfaces ofi thea-braders, which cut awaythematerial, like a file,'leavingtheedgesof the shearssh ar ,fie rv Asthe i shearsareimoved enemy or the other, as the blades oftlle shearsbeing pressed against the .abrading surfaces;

case may be, across the abraders and the angle between the blades variesin consequence,

the abraderswill correspondingly rock on their trunnions, as indicatedin the figure, and so keep their roughened surfaces flat against theedges of the blades. This I regard asan important feature of theinvention as by this construction and by these means both blades of theshears are sharpened simultaneously and alike. 7

7 When the abraders turn in either direction to have their edges meet ateither side of the spindle 7 they touch, at their rear sides, thesurface of the spindle, as appears in Figs. 2 and 4, which constitutes astop for limiting their rocking motions either way. The spindle thusstopping the motions of the abraders also serves to cause them to meettruly and evenly at their edges, as appears in Fig. 2, and prevent themfrom taking positions in whic the edge of one will lap over or pass theother.

In this device for sharpening shears I employ, also, blocks 12 12 ofsome fine abrading material or granulated substance as corundum, fineemery, or the like, to give to the blades of the shears finer andsmoother cutting edges after rubbing them across the metallic abraders1, as stated. These blocks are, as a matter of convenience, formed withslanting edges and inserted in corresponding transverse dovetailopenings or recesses formed in the abraders, the latter constitutingtilting elements or holders for the granulated blocks.

With this device I also employ a gage 13, I

Figs. 6 and 7, by'means of which to give the desired slant or bevel tothe edge-surfaces of the shear blades. This gage comprlses a body 14, asof hard wood, with eccentric, inclined periphery, held by a threadedstud or screw 15 r1g1d in a sprin holder or elastic e edges of theupclamp 16 formed to clasp t per abrading plate 1, as shown. The gagemay be slipped laterally along the holding abrader to any positiondesired, the body 14 bein made temporarily rigid in position on the casp 16 at any time by a thumb-nut 17 on the stud 15. The curved face ofthe body 14 being of spiral form causes the body to presentvariousslants or degrees of inclination as it is'turned on the stud 15.In use,

when sharpening shears, the fiat face 18 of the blade u permost isplaced squarely against the s ant side of the. body 14 when being passedacross the abrader, which serves to give to the narrow cutting edges ofthe blades the desired transverse incline or slant.

It is'clear that the manner of roughing the abrading surfaces of theelements 1 1 is not essential to this invention, this being a matter ofjudgment, or of convenience in given cases. In Figs. 1 and 3 theabrading surfaces are represented as being out something like thecutting of a float file; and this cutting may be done in a manner tohave the sharp ridges or teeth incline laterally one way or the other soas to sharpen shears by pushing them onto the abraders or when pullingthem off, as the case may be, the teeth being ada ted to act in only onedirection. Also, a p ain head, as indicated by the reference figure 4,may be substituted for the head 3 if found convenient and desirable inconstructing these sharpening devices. Other simple details ofconstruction may also be varied or changed without departing from the sirit of the invention.

W lat I claim as my invention and desire to secure by Letters Patentis 1. A device for sharpening shears, having head portions connected byan axial spindle,

and a pair of pivoted gravitating abraders held by the head portions.

2. A device for sharpening shears, having a pair of coaxial heads, aspindle connecting the heads, a pair of gravitating abrading platesformed to have bearings in said respective heads, said plates being heldto gravitate in opposite directionsto have their adjacent edges meet oneither side of the spindle. I

3. A device for sharpening shears, having a pair of heads and a centralspindle joining the heads, a pair of gravitating abraders held to tiltlaterally between the heads, said abraders having parallel axes, andbeing adapted to turn in positions to meet at their edges and to restagainst said spindle in their tilted positions.

4. A device such as described, having a handle with a head, a spindlerojecting axially from the head and rigid therewith, a head pierced bythe s indle at its op osite end and adapted to slid e upon the s ind lethe latter being screw-threaded, and a mob with threaded nut to turn onthe spindle in engagement with its threaded end to press said slidablehead toward the opposing head, sto s on the spindle for the movablehead, an gravitating abraders pivoted between said opposing heads toassume opposite positions y gravity.

5. In a device for sharpening shears, a spindle having a handle at oneend; a head on the opposite end of the spindle; and a opposite end ofthe spindle; and a pair of gravitating abraders pivoted between said myhand this 27th day of February, 1907, in gandle danddheaml b the saidhspindle 1being the. presence of two subscribing Witnesses.

ispose mi Way etween t e pivota axes of the abraders and beingof a, sizeto form v GEORGE SHEFFIELD 5 a stop for limiting their rocking motionsin Witnesses:

both directions. E. B. WHITMORE, In witness whereof, I have hereunto setA. M. WHITMORE.

